Packaging film and pouch battery

Abstract

The invention provides a packaging film and a soft pack battery. The packaging film includes an outer protection layer, an inner fusion layer and a metal layer between the outer protection layer and the inner fusion layer. Wherein, at least one outer end surface of the inner fusion layer at the edge protrudes beyond the corresponding outer end surface of the metal layer. The soft pack battery includes: electric core; and two layers of packaging film, the two layers of packaging film enclose the inner cavity for storing the electric core in the middle, and the inner cavity is sealed and connected. Wherein, on each layer of packaging film, the part of the inner fusion layer that exceeds the corresponding outer end surface of the metal layer is folded back onto the outer protective layer to cover the corresponding outer end surface of the metal layer. On each layer of packaging film, the part of the inner fusion layer that exceeds the corresponding outer end surface of the metal layer can be folded back to cover the corresponding outer end surface of the metal layer, thereby insulating and sealing the metal layer. Therefore, the pouch battery of the present invention can utilize its own The structure realizes the insulation and sealing of the outer end surface without using other edge-sealing materials, thereby simplifying the edge-sealing process of the pouch battery and improving the edge-sealing effect.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a packaging film and a soft pack battery. Background technique [0002] Soft-pack lithium-ion batteries currently mainly use aluminum-plastic composite film for cell packaging. The aluminum-plastic film is mainly divided into a three-layer structure of a protective layer, a metal layer and a fusion layer. After packaging and edge trimming during packaging, the metal layer at the edge of the package cannot be wrapped and exposed, which may easily lead to problems such as short circuits. [0003] At present, the edge sealing structure of the battery mainly includes two kinds of structure, the single folding edge structure and the double folding edge structure. The single folded edge structure of the rubber wrapping is to paste the insulating tape on the edge of the battery package, and then use the mechanical method to fold up the package edge and paste it on the side of the main body of ...

AI Technical Summary

Problems solved by technology

[0004] Both edge-sealing structures can solve the problem of exposed aluminum in conventional batteries, but they also have their own limitations, especially when the edge-sealing treatment of non-rectangular batteries is performed on non-linear edges. On the one hand, For non-straight edges, the insulating tape cannot completely cover the edge of the packaging edge, and there is a risk of aluminum exposure. For curved edges such as rounded corners, there are problems such as tape wrinkling and overlapping, causing appearance defects, and after a certain period of use, The tape may be warped or turned at the beginning and end, causing appearance defects and the risk of aluminum exposure; The folded edge structure, the double folded edge process is cumbersome, and the width of the battery is increased at the same time, which easily leads to the size exceeding the specification

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